--- src/common/apple_platform_utils.h.orig
+++ src/common/apple_platform_utils.h
@@ -20,8 +20,10 @@
 #endif
 
 #define ANGLE_APPLE_OBJC_SCOPE @autoreleasepool
+#define ANGLE_APPLE_POOLSTART NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
+#define ANGLE_APPLE_POOLEND [pool release];
 
-#if !__has_feature(objc_arc)
+#ifndef __clang__
 #    define ANGLE_APPLE_AUTORELEASE autorelease
 #    define ANGLE_APPLE_RETAIN retain
 #    define ANGLE_APPLE_RELEASE release
@@ -33,7 +35,7 @@
 
 #define ANGLE_APPLE_UNUSED __attribute__((unused))
 
-#if __has_warning("-Wdeprecated-declarations")
+#ifdef __GNUC__
 #    define ANGLE_APPLE_ALLOW_DEPRECATED_BEGIN \
         _Pragma("GCC diagnostic push")         \
             _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
@@ -41,7 +43,7 @@
 #    define ANGLE_APPLE_ALLOW_DEPRECATED_BEGIN
 #endif
 
-#if __has_warning("-Wdeprecated-declarations")
+#ifdef __GNUC__
 #    define ANGLE_APPLE_ALLOW_DEPRECATED_END _Pragma("GCC diagnostic pop")
 #else
 #    define ANGLE_APPLE_ALLOW_DEPRECATED_END
--- src/common/apple_platform_utils.mm.orig
+++ src/common/apple_platform_utils.mm
@@ -11,13 +11,24 @@
 #include "common/unsafe_buffers.h"
 
 #include <Foundation/Foundation.h>
-#include <Metal/Metal.h>
+#include <AvailabilityMacros.h>
+
+#if MAC_OS_X_VERSION_MIN_REQUIRED >= 101100
+#    include <Metal/Metal.h>
+#endif
+
+#if MAC_OS_X_VERSION_MIN_REQUIRED < 120000
+#    define kIOMainPortDefault kIOMasterPortDefault
+#endif
 
 namespace angle
 {
 
 bool IsMetalRendererAvailable()
 {
+#if MAC_OS_X_VERSION_MIN_REQUIRED < 101100
+    return false;
+#else
 #if defined(ANGLE_PLATFORM_MACOS) || defined(ANGLE_PLATFORM_MACCATALYST)
     static bool queriedMachineModel    = false;
     static bool machineModelSufficient = true;
@@ -117,6 +128,7 @@
         }
     }();
     return gpuFamilySufficient;
+#endif
 }
 
 #if defined(ANGLE_PLATFORM_MACOS) || defined(ANGLE_PLATFORM_MACCATALYST)